#include <iostream>

using namespace std;

int main(){

    double a, b, c;
    cin >> a >> b >> c;
    if(a + b> c && a + c > b && b + c > a)
        printf("Perimetro = %.1lf\n", a + b + c);
    else 
    printf("Area = %.1lf\n", (a+b) *c / 2);

    return 0;
}